L. BUSINESS CONCENTRATION

For the three months ended March 31, 2018, one
customer represented approximately 14% of total net revenues. For the three months ended March 31, 2017, one customer represented
approximately 11% of total net revenues. As of March 31, 2018, three customers accounted for approximately 38% of the Company’s
net accounts receivable. As of December 31, 2017, three customers accounted for approximately 54% of the Company’s net accounts
receivable.

Purchases from one supplier approximated $760,000,
or 82%, of purchases for the three months ended March 31, 2018 and $595,000, or 68%, of purchases for the three months ended March
31, 2017. Total due to this supplier, net of deposits, was approximately $23,142 as of March 31, 2018, and $32,697 as of December
31, 2017.

The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date.